Actually got this by accident, thinking it was a different series. I was moderately favorable toward the first in the series, but not particularly interested. This one takes off right after the last book, with the Big Bad Guy still somewhere out there, and Midnight Gunn (a name nobody in the series seems to comment on or think is unusual) is Concerned.
Gunn is a good example of a male lead written by a female author, that is it doesn't quite connect and feels more like what a woman might imagine a perfect man being rather than an actual male with male thoughts, motivations, and presuppositions.
The story was interesting enough, with Scottish mythology such as Pookas and the titular Barghest featuring, as well as a spooky fae castle. What it is exactly Gunn does and can do with this light and dark powers is not particularly clear, nor is the extent of how powers manifest in the world. His adopted daughter Polly seems to have some sort of aura vision power, and his enemy is a necromancer, but its not clear how common this is, and it does not at any level appear to have affected the world to have people with these powers in it.
Still, its entertaining and likable enough, and Gunn is a bit more distinct a personality than in the previous book although the women all kind of blend together and are difficult to distinguish.